CN106402262B - A kind of adjustable magnetic quasi-zero stiffness vibration isolators of rigidity - Google Patents
A kind of adjustable magnetic quasi-zero stiffness vibration isolators of rigidity Download PDFInfo
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- CN106402262B CN106402262B CN201611039718.7A CN201611039718A CN106402262B CN 106402262 B CN106402262 B CN 106402262B CN 201611039718 A CN201611039718 A CN 201611039718A CN 106402262 B CN106402262 B CN 106402262B
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- 238000006073 displacement reaction Methods 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 31
- 230000008859 change Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000007769 metal material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
- F16F15/0232—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means with at least one gas spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention belongs to vibration and noise control technology field, it is related to a kind of passive isolation technology of superlow frequency vibrating with strong applicability.In order to effectively solve the problem between vibration isolator low-frequency vibration transport and dither attenuation rate, the adjustable magnetic quasi-zero stiffness vibration isolators of rigidity that negative stiffness, elastic sack body provide positive rigidity are produced the invention provides a kind of use rectangle permanent magnet；When the load, control elastic sack body operating position is constant, and elastic sack body causes its positive stiffness change because internal pressure changes, and then makes negative stiffness and positive Rigidity Matching by adjusting the spacing of rectangular magnet, is suitable for the vibration isolation object of different weight.Simple in construction, easy for installation, the adjustable, anti-vibration performance of carrying of the present invention is superior, and compact conformation, lightweight, is adapted to popularization and application.
Description
Technical field
The invention belongs to vibration and noise control technology field, be related to a kind of superlow frequency vibrating with strong applicability it is passive every
From technology, and in particular to a kind of adjustable magnetic quasi-zero stiffness vibration isolators of rigidity.
Background technology
It is well known that being m for a quality, rigidity is the k linear vibrating isolation system of single-degree-of-freedom, the intrinsic frequency of system
ForOnly driving frequency is more thanWhen, system just has vibration isolating effect.Fixed for a vibration isolation object
Vibrating isolation system, in order to improve the vibration isolating effect of system, need to reduce system stiffness k, but rigidity k reduction can cause the quiet change of system
Deformation is big, it is difficult to meet the stability requirement of system.To solve this technical problem, scholars propose with high Static stiffness and
The quasi-zero stiffness vibration isolators of low dynamic stiffness, make it while meet the requirement of high bearing capacity and low dynamic stiffness, are meeting certain bar
In the case of part, low-frequency vibration can be effectively isolated.
Quasi-zero stiffness vibration isolators are the combined vibration isolators that a kind of positive rigidity is matched with negative stiffness, in equipoise
It is certain interval interior with less composite rigidity.On the one hand, if by the weight of vibration isolation object not being the ideal weight of design, i.e. quilt
Vibration isolation object is placed on quasi-zero stiffness vibration isolators, it is impossible to stable on preferable equipoise, quasi-zero stiffness vibration isolators
Performance will be affected.For this problem, patent of invention CN104455181A, CN203641365U, CN202132428U and
CN102678804A, is that the decrement for adjusting positive rigid spring by adjusting set makes system reach equipoise, still, just
The precompressed amount regulated quantity of rigid spring is limited, when having relatively large deviation by vibration isolation weight of object and the ideal weight of design, the party
Method is difficult to reach preferable effect.On the other hand,, will very by adjusting precompressed amount if a certain rigidity of vibration isolator changes
Difficulty reaches preferable quasi- nought state.
The content of the invention
To solve the problem of above-mentioned prior art is present, the invention provides a kind of quasi- zero stiffness of the adjustable magnetic of rigidity every
Shake device, and producing negative stiffness, elastic bag using rectangle permanent magnet provides a kind of positive adjustable quasi-zero stiffness vibration isolators of rigidity Design,
Make it just firm with change by the negative stiffness for controlling elastic bag operating position constant and adjust negative stiffness magnetic governor motion
Degree matches, be suitable for different weight by vibration isolation object；There should be simple in construction, easy for installation, the features such as carrying adjustable, and
Its vibration isolation initial frequency is low, and bearing capacity is high, can imitate the problem solved between low-frequency vibration transport and dither attenuation rate,
Suitable for the vibration isolation field of automobile, ship, aircraft, precision instrument etc..
To achieve the above object, the technical solution adopted by the present invention is：
A kind of adjustable magnetic quasi-zero stiffness vibration isolators of rigidity, including it is load platform, negative stiffness magnetic governor motion, just firm
Spend elastic sack body and cabinet；The load platform is arranged on top outside cabinet, and cabinet inside sets negative stiffness magnetic regulation machine
Structure and positive rigidity elastic sack body；Wherein, the top of negative stiffness magnetic governor motion passes cabinet top by guide rod and put down with load
Platform is connected, and the bottom of negative stiffness magnetic governor motion is connected with the top of positive rigidity elastic sack body, positive rigidity elastic sack body
Bottom is connected with cabinet bottom；The positive rigidity elastic sack body includes upper cover plate, lower cover and elastic bag, elastic bag
Connected with gas circuit position holding device, when the load change on load platform, elasticity is kept by gas circuit position holding device
The operating position of air bag is constant, makes vibration isolator stable on preferable equipoise；The magnetic quasi-zero stiffness vibration isolators are whole
Central axis of the individual device along guide rod is in symmetrical structure.Be placed on by vibration isolation object on load platform, by vibration isolation object, guide rod,
Center magnet and elastic bag must assure that centering.
The negative stiffness magnetic governor motion includes center magnet and is symmetricly set on the external magnet of center magnet both sides,
The center magnet and external magnet are rectangular magnet, and the height of middle section keeps concordant；External magnet and lateral displacement
Adjusting means is connected.
The center magnet is clamped using top board and lower platen；Top board is connected using the first bolt with guide rod,
Guide rod passes cabinet top and is connected with load platform；Lower platen is connected using the second bolt with the upper cover plate of positive rigidity elastic sack body
It is fixed；The lateral displacement adjusting means is fixed on the sidepiece of casing, and it includes U-shaped clamp and the 3rd bolt, and U-shaped clamp is opened
Mouth direction is relative with center magnet, and external magnet is fixed at the opening of U-shaped clamp；One end of 3rd bolt and U-shaped clamp side
The middle part in portion is fixed, and the other end passes the sidepiece of cabinet；The both sides that 3rd bolt passes the position of cabinet sidepiece set the first spiral shell
Female and the second nut, the 3rd is bolted on side plate (connection for realizing U-shaped clamp and side plate)；3rd bolt is passed
One end of casing sidepiece starts to open up keyway parallel to axial direction, is connected between the 3rd bolt and the sidepiece of cabinet using key
Connect, when making the spacing for the first nut regulation external magnet and center magnet for turning the 3rd bolt of regulation, external magnet only occurs
Transverse shifting is without rotating.
The middle part of top board and lower platen laminating the center magnet side opens up groove, the first bolt and the second spiral shell respectively
Bolt is separately fixed in the groove that top board and lower platen are opened up.
The U-shaped clamp opens up groove in the middle part of external magnet sidepiece, and the 3rd bolt passes through U-shaped through U-shaped clamp
Clamp sidepiece is fixed in groove, and sets the 3rd nut between U-shaped clamp and the second nut, will by adjusting the 3rd nut
U rows clamp and the locking of the 3rd bolt.
The top board and lower platen symmetrically open up chute along the first bolt both sides respectively, what top board and lower platen were opened up
Chute upper-lower position correspondence；The both sides of center magnet are fixed through chute using the 4th bolt；The size of 4th bolt with
The matching size of chute is closed, and the fixation and more of different size center magnets along chute direction adjusting position and fixation, can be achieved
Change.
The upper and lower ends of the U-shaped clamp open up screwed hole, are fixed on external magnet using upper and lower 5th bolt U-shaped
At the opening of clamp；It can ensure that external magnet is overlapped with the middle section of center magnet by the 5th bolt for adjusting upper and lower setting,
And the replacing of different size external magnet can be realized.
The elastic bag can select bellows type air spring or diaphragm type air spring etc..
The gas circuit position holding device includes displacement transducer, controller, the source of the gas control for controlling source of the gas inflation/deflation
Unit processed, the inflation/deflation control unit for carrying out inflation/deflation to elastic bag, source of the gas, hub；Displacement transducer is arranged at
On the upper cover plate of positive rigidity elastic sack body；The controller using hub respectively with displacement transducer, source of the gas control unit, fill
Deflation control unit is connected；The source of the gas, source of the gas control unit, inflation/deflation control unit and elastic bag are entered using gas circuit successively
Row connection；The displacement signal for the upper cover plate that controller is launched according to the displacement transducer that receives, control source of the gas control unit and
Inflation/deflation control unit is inflated or deflated to elastic bag, the pressure in adjustment elastic bag, keeps the work of elastic bag
Make position constant.
The lower cover opens up the stomata and string holes for leading to elastic bag respectively, and the exit of string holes is inserted provided with hermetic seal
Seat.
The cabinet top opens up centre bore, and guide rod passes centre bore position and sets sliding bearing, and its size is respectively with leading
The aperture of bar external diameter and centre bore is engaged；Using the cooperation of sliding bearing and guide rod, the radial motion of guide rod is limited, is prevented
There is stuck phenomenon.
The guide rod uses the 6th bolt connection with load platform, and the 6th bolt bottom opens up keyway, key is used with guide rod
Connection, prevents being rotated by the relatively described magnetic quasi-zero stiffness vibration isolators of vibration isolation object on load platform.
The center magnet and external magnet transversely magnetize, and magnetizing direction is identical；Using Nd-Fe-B rare-earth permanent magnet iron
Material.Except center magnet, external magnet, elastic sack body and by vibration isolation object in addition to, remaining part is using non-magnetic or weak magnetic conduction
Metal material.The metal material of described non-magnetic or weak magnetic conduction preferably 304 stainless steels.
The negative stiffness technical principle of the adjustable magnetic quasi-zero stiffness vibration isolators of rigidity of the present invention is as follows：
Theoretical according to Equivalent Magnetic Charge, the magnetic force between two blocks of magnet is interacted by the left and right end face of left and right magnet to be produced,
Two pieces of parallel magnetostatic energies of magnetizing direction are：
Wherein：The size of left and right magnet is respectively 2a × 2b × 2c and 2a ' × 2b ' × 2c ', dielectric polorization intensity difference
For J and J ', place coordinate system is respectively that O-XYZ and O '-X ' Y ' Z ', O ' coordinate are (x, y, z).Uij=x+ (- 1)ja′-(-1
)iA, Vlk=y+ (- 1)kb′-(-1)lB, Wpq=z+ (- 1)qc′-(-1)pC,Can after quad-slope integration
：
Wherein
Can obtain the magnetic force between two magnet according to the principle of virtual work is：
When two pieces of magnet magnetizing directions are identical, F takes just, and on the contrary then F takes negative, the item that the multiple summation of omission is zero：
To formula (4) respectively in different directions derivation, and the item that multiple summation is zero is omitted, the negative stiffness between two magnet can be obtained
For：
When different from design load by the real load of vibration isolation object, by controlling elastic bag operating position constant simultaneously
Regulation negative stiffness magnetic governor motion negative stiffness make itself and positive Rigidity Matching, be suitable for different weight by vibration isolation object.
Compared with prior art, beneficial effects of the present invention are the present invention：
1) present invention is using elastic bag as positive stiffness reliability structure, and its bearing capacity is strong, and when the load,
Its operating point is constant, it is ensured that quasi-zero stiffness vibration isolators can be stablized on preferable equipoise.
2) negative rigidity mechanism of the invention is using three pieces of rectangular magnets, no mechanical abrasion, without lubrication, long lifespan, and just
Degree easily regulation, nonlinear degree is small, can preferably with positive Rigidity Matching.
3) present invention is integrated by air spring (elastic bag) and rectangle permanent magnet (magnet), combines air spring high frequency
Vibration isolation and the advantage of permanent magnet low frequency spectrum lines vibration isolation, with relatively low vibration isolation initial frequency and larger vibration attenuation rate.
4) magnet clamping device of the invention can realize the replacing of different size magnet, increase the regulation model of negative stiffness
Enclose, improve the scope of application of system.
5) present invention except center magnet, external magnet, elastic sack body and by vibration isolation object in addition to, remaining part is not using leading
The metal material of magnetic or weak magnetic conduction, it is to avoid interfered to the magnetic field that permanent magnet is produced, can be in metal parts when system works
Vortex flow is produced, the damping characteristic of system can be improved.
6) when the present invention can overcome the existing quasi-zero stiffness vibration isolators to align rigidity and be adjusted, the precompressed of rigid components is aligned
Restricted problem is measured, it is made by the negative stiffness for controlling the operating position of elastic bag constant and adjust negative stiffness magnetic governor motion
With positive Rigidity Matching, be suitable for different weight by vibration isolation object.
7) present invention have the advantages that compact conformation, be convenient to mount and dismount, reliability height, less energy consumption, adaptability it is good, to larger amplitude
The excitation of value and the object of different weight are respectively provided with preferable vibration isolating effect, and vibration isolation bandwidth, amplitude attenuation rate is big.
Brief description of the drawings
Fig. 1 is the sectional view of the quasi-zero stiffness vibration isolators of one embodiment of the invention.
Fig. 2 is the clamping installation diagram of external magnet.
Fig. 3 is the clamping installation diagram of center magnet.
Fig. 4 is the hardware catenation principle schematic diagram of gas circuit position holding device.
Fig. 5 is the negative stiffness curve of negative stiffness magnetic governor motion under different magnet spacing.
Fig. 6 is rigidity-displacement curve of quasi-zero stiffness vibration isolators.
Wherein：Magnetic outside 1- load platforms, 2- cabinet end caps, 3- cabinet side boards, 4- chassis bases, 5- center magnets, 6-
Iron, 7- top boards, 8- lower platens, the bolts of 9- first, 10- guide rods, 11- sliding bearings, the bolts of 12- second, 13- chutes, 14-
Four bolts, 15-U type clamps, the bolts of 16- the 3rd, 17- keys, the nuts of 18- first, the nuts of 19- the 3rd, the nuts of 20- second, 21-
Five bolts, 22- elastic bags, 23- upper cover plates, 24- lower covers, 25- boss, 26- stomatas, 27- string holes, 28- gas-tight seal sockets,
The bolts of 29- the 6th, 30- square washers, 31- is by vibration isolation object, and 32- controllers, 33- displacement transducers, 34- inflation/deflations control is single
Member, 35- source of the gas control unit sources of the gas, 36- sources of the gas, 37- hubs, 38- cables, 39- gas circuits.
Embodiment
The present invention is described in further detail with specific implementation below in conjunction with the accompanying drawings, it is therefore an objective to help the technology of this area
Personnel have more complete, accurate and deep understanding to design of the invention, technical scheme, and help to implement.
As shown in Figure 1, 2, 3, the adjustable magnetic quasi-zero stiffness vibration isolators of a kind of rigidity, it includes load platform 1, negative stiffness
Magnetic governor motion, positive rigidity elastic sack body and cabinet；The cabinet includes cabinet end cap 2, cabinet side board 3 and machine from top to bottom
Bottom seat 4；The load platform 1 is arranged on the top outside cabinet, and cabinet inside sets negative stiffness magnetic governor motion and just
Rigidity elastic sack body；Wherein, the top of negative stiffness magnetic governor motion using guide rod 10 pass cabinet end cap 2 (cabinet top) with
Load platform 1 is connected, and the bottom of negative stiffness magnetic governor motion is connected with the top of positive rigidity elastic sack body, positive rigidity elasticity
The bottom of utricule is connected with chassis base 4 (cabinet bottom)；The positive rigidity elastic sack body includes upper cover plate 23, lower cover
24 and elastic bag 22 (diaphragm type air spring), the stomata 26 and string holes 27 for leading to elastic bag are opened up respectively on lower cover 24,
The exit of stomata 26 is provided with gas-tight seal socket 28, and elastic bag 22 is using stomata 26 and string holes 27 and gas circuit position holding device
Realization is tightly connected and connected, and the operating position of elastic bag 22 keeps constant when the load, and the vibration isolator can be made steady
It is scheduled on preferable equipoise；Central axis of the magnetic quasi-zero stiffness vibration isolators whole device along guide rod is in symmetrical junction
Structure.
The negative stiffness governor motion includes center magnet 5 and is symmetricly set on the external magnet 6 of center magnet both sides, institute
It is rectangular magnet to state center magnet 5 and external magnet 6；Wherein, center magnet 5 is pressed from both sides using top board 7 and lower platen 8
Hold, the middle part of top board 7 and lower platen 8 laminating the center magnet side opens up groove respectively；One end of first bolt 9 is fixed
In the groove of top board 7, the other end is connected with guide rod 10；Cabinet end cap 2 sets centre bore, and guide rod 10, which is passed, to be arranged on
The sliding bearing 11 of centre bore is connected with load platform 1 using the 6th bolt 29；Under one end of second bolt 12 is fixed on
In the groove of pressing plate 8, the upper cover plate 23 of the other end and positive rigidity elastic sack body is connected；8 points of the top board 7 and lower platen
Not symmetrically open up chute 13 along the both sides of the first bolt 9, top board 7 is corresponding with the upper-lower position of chute 13 that lower platen 8 is opened up；Adopt
The both sides of center magnet 5 are symmetrically fixed through chute 13 with 4 group of the 4th bolt 14；The size of 4th bolt 14 and chute 13
Matching size close, and the fixation and more of different size center magnets 5 can be achieved along the direction adjusting position of chute 13 and fixation
Change；External magnet 6 is respectively adopted U-shaped clamp 15 and is fixed on by the 3rd bolt 16 on cabinet side board 3, the opening of U-shaped clamp 15
Direction is relative with center magnet 5, and external magnet 6 is fixed at the opening of U-shaped clamp 15；The U-shaped clamp 15 is close to outside magnetic
Groove is opened up in the middle part of the sidepiece of iron 6, one end of the 3rd bolt 16 is fixed in the groove of U-shaped clamp 15, and the other end passes cabinet
Side plate 3；The both sides that 3rd bolt 16 passes the position of cabinet side board 3 set the first nut 18 and the second nut 20, by the 3rd spiral shell
Bolt 16 is fixed on cabinet side board 3, and external magnet 6 makes its relative center magnet 5 along level side by adjusting the 3rd bolt 16
To distance it is adjustable, by changing negative stiffness size, the positive Rigidity Matching of itself and positive rigidity elastic sack body is realized standard zero；It is described
One end that 3rd bolt 16 passes cabinet side board 3 starts to open up keyway, the 3rd bolt 16 and cabinet side board 3 parallel to axial direction
Between be attached (at contact surface) with key 17, adjust center magnet 5 and outer by turning the first nut 18 and the second nut 20
During the spacing of portion's magnet 6, external magnet 6 is set to occur transverse shifting without rotating；3rd bolt 16 is in U-shaped clamp
15 and second set the 3rd nut 19 between nut 20, and U-shaped clamp 15 and the 3rd bolt 16 are clamped；U-shaped clamp is two about 15
End opens up screwed hole, is fixed on external magnet 6 at the opening of U-shaped clamp 15 using upper and lower 5th bolt 21；Pass through regulation
Upper and lower 5th bolt 21 can ensure that external magnet 6 and the middle section of center magnet 5 are overlapped, and can realize different size external magnetic
The replacing of iron 6.
The gas circuit position holding device by displacement transducer 33, source of the gas 36, controller 32, source of the gas control unit 35, fill
Deflation control unit 34, hub 37, cable 38 and gas circuit 39 are constituted (schematic diagram is shown in Fig. 4)；Displacement transducer 33 is arranged on
On cover plate 23；The controller 32 is connected by cable 38 with hub 37, hub 37 respectively with displacement transducer 33, source of the gas
Control unit 35, inflation/deflation control unit 34 are connected, displacement transducer 33, inflation/deflation control unit 34, source of the gas control unit 35
Signal pass through cable 38 and hub 37, controller 32 and mutually transmit；Inflation/deflation control unit 34 by gas circuit 39 respectively with
Source of the gas control unit 35 and elastic bag 22 are connected, and the gas in source of the gas 36 is connected through gas circuit 39 with source of the gas control unit 35；It is logical
Cross controller 32 and analyzing and processing control source of the gas control unit 35 and inflation/deflation control unit are carried out to the signal of displacement transducer 33
Pressure in 34 adjustment elastic bags, keeps the operating position of elastic bag 22 constant.
The bottom of 6th bolt 29 opens up keyway, is connected with guide rod 10 using key, prevent on load platform by vibration isolation
The relatively described magnetic quasi-zero stiffness vibration isolators of object rotate.
3 groups of square washers 30 are also set up on 4th bolt 14, for fixing and protecting center magnet 5.
The upper cover plate 23 is connected with the second bolt 12, and lower cover 24 is fixed on chassis base 4；Chassis base 4 is set
Boss 25, the breach set with lower cover 24 is engaged.
The external magnet and center magnet are constituted by the big NdFeB material of residual magnetization, except external magnet, centre
Magnet, elastic sack body and by vibration isolation object outside, remaining part use 304 stainless steels.Center magnet and the external magnet edge
Laterally magnetize, and magnetizing direction is identical, in state of repelling each other between center magnet and external magnet.
It is described that higher centering must assure that by vibration isolation object, guide rod, middle magnetic patch and air bag vibration isolator.
The operation principle of the present invention is as follows：When being changed by the mass of vibration isolation object 31, positive rigidity elastic sack body 34
Operating position keeps constant, and causes itself positive stiffness change because internal pressure changes, and the present invention is using three pieces of rectangles
Magnet (center magnet and external magnet) provide negative stiffness (the negative stiffness curve of negative stiffness governor motion is shown in Fig. 5) make its with it is just firm
Degree matching, vibrating isolation system rigidity near equilbrium position realizes zero (see Fig. 6) of standard.When vibrating isolation system be in it is static when, by
In the symmetrical structure of setting, external magnet is zero to the axial force of center magnet, therefore magnet spring (positive rigidity elastic sack body)
The bearing capacity of vibration isolator is not interfered with, and non-magnetic metal can produce vortex flow in magnetic field, can improve the resistance of the present invention
Damping characteristics.
To sum up, quasi-zero stiffness vibration isolators of the present invention have high quiet low dynamic characteristic, can be before bearing capacity is ensured
Putting makes resonant frequency very low, so as to widen vibration isolation frequency band, improve vibration isolating effect.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.Above only
For presently preferred embodiments of the present invention, not for limiting protection scope of the present invention.It is all in the spirit and principles in the present invention
Within, any modification made, equivalent substitution, improvement etc., it should be included in the scope of the protection.
Claims (8)
1. a kind of adjustable magnetic quasi-zero stiffness vibration isolators of rigidity, it is characterised in that adjusted including load platform, negative stiffness magnetic
Mechanism, positive rigidity elastic sack body and cabinet；The load platform is arranged on top outside cabinet, and cabinet inside sets negative stiffness magnetic
Property governor motion and positive rigidity elastic sack body；Wherein, the top of negative stiffness magnetic governor motion passes cabinet top by guide rod
It is connected with load platform, the bottom of negative stiffness magnetic governor motion is connected with the top of positive rigidity elastic sack body, positive rigidity bullet
The bottom of property utricule is connected with cabinet bottom；The positive rigidity elastic sack body includes upper cover plate, lower cover and elastic bag,
Elastic bag is connected with gas circuit position holding device；Central axis of the magnetic quasi-zero stiffness vibration isolators whole device along guide rod
In symmetrical structure；
The negative stiffness magnetic governor motion includes center magnet and is symmetricly set on the external magnet of center magnet both sides, described
Center magnet and external magnet are rectangular magnet, and the height of middle section keeps concordant；External magnet is adjusted with lateral displacement
Device is connected；
The gas circuit position holding device includes displacement transducer, controller, source of the gas control unit, inflation/deflation control unit, gas
Source and hub, displacement transducer are arranged on the upper cover plate of positive rigidity elastic sack body；The controller is connected with hub, collection
Line device is connected with displacement transducer, source of the gas control unit, inflation/deflation control unit respectively；The source of the gas, source of the gas control unit, fill
Deflation control unit is connected using gas circuit successively with elastic bag；Controller is handled simultaneously the signal of displacement transducer
Control source of the gas control unit and inflation/deflation control unit are inflated or deflated to elastic bag, the pressure in adjustment elastic bag
Power, keeps the operating position of elastic bag constant.
2. magnetic quasi-zero stiffness vibration isolators according to claim 1, it is characterised in that the center magnet uses top board
Clamped with lower platen；Top board is connected using the first bolt with guide rod, and guide rod passes cabinet top and is connected with load platform；
Lower platen is connected using the upper cover plate of the second bolt and positive rigidity elastic sack body；The lateral displacement adjusting means is fixed on
The sidepiece of casing, it includes U-shaped clamp and the 3rd bolt, and the opening direction of U-shaped clamp is relative with center magnet, external magnet folder
Hold at the opening of U-shaped clamp；One end of 3rd bolt and the middle part of U-shaped clamp sidepiece are fixed, and the other end passes the side of cabinet
Portion；Cabinet sidepiece both sides set the first nut and the second nut to be bolted to the 3rd on side plate；3rd bolt is passed
One end of casing sidepiece starts to open up keyway parallel to axial direction, is connected between the 3rd bolt and the sidepiece of cabinet using key
Connect.
3. magnetic quasi-zero stiffness vibration isolators according to claim 2, it is characterised in that top board and the lower platen difference
Chute is symmetrically opened up along the both sides of the first bolt, top board is corresponding with the chute upper-lower position that lower platen is opened up；Using the 4th spiral shell
Bolt fixes the both sides of center magnet through chute；Position of 4th bolt along chute direction is adjustable.
4. magnetic quasi-zero stiffness vibration isolators according to claim 2, it is characterised in that the upper and lower ends of the U-shaped clamp
Screwed hole is opened up, is clamped in external magnet at the opening of U-shaped clamp using the 5th bolt of upper and lower setting.
5. magnetic quasi-zero stiffness vibration isolators according to claim 2, it is characterised in that the external magnet and center magnet
Transversely magnetize, and magnetizing direction is identical.
6. magnetic quasi-zero stiffness vibration isolators according to claim 1, it is characterised in that the lower cover is opened up respectively to lead to
The stomata and string holes of elastic bag, the exit of string holes are provided with gas-tight seal socket.
7. magnetic quasi-zero stiffness vibration isolators according to claim 1, it is characterised in that the cabinet top opens up center
Hole, guide rod passes centre bore position and sets sliding bearing, and aperture of its size respectively with guide rod external diameter and centre bore is engaged.
8. magnetic quasi-zero stiffness vibration isolators according to claim 1, it is characterised in that the guide rod is used with load platform
6th bolt connection, the 6th bolt bottom opens up keyway.
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